Evidently I have a thing for hotrod 22's. I've got a 220SwiftAI, a 22-250AI, and a 22-243AI. I don't have my load book with me right now, but IIRC the 22-250AI is running 80's at 3400 fps and the 22-243AI is running 90's at 3500 fps. There definitely is a velocity gain with the added case...